The article is not very clear. It looks like most of the problem is caused by population grow, without good infrastructure. Not by Coca-Cola.

Also, this is misleading:

> FEMSA reports that it uses 56.9 billion liters of water a year in its operations across Latin America. In Mexico, the company holds 40 water permits.

The 56.9 billon liters seams to be a lot and it is a lot, but it's the total in Latin America. But this number is not related to the problem in Chiapas. How much water does the plant in Chiapas use?